Ok guys, while maths is not my strong point I've been able to source some spring rates in lbs/in and convert them to kgs/cm so we can see how stock ek and EK9 spring rates compare to Spoon and a variety of other aftermarket springs on the market:
What we can conclude is the Spoon progressive springs are almost twice as hard as stock EKs (EX model), and while they are firmer in the front than CTRs, Spoons are a little softer in the rears.
For 96-00 Civics
Front (kgs/cm)~ Rear (kgs/cm)
96-00 EX 2.9~ 1.4
99-00 Si (EM1) 3.6~ 1.8
CTR 4.3~ 4.3
Spoon Progress Lowering Springs 5.7~ 3.6
H&R OE 5.0~ 3.4
Eibach ProKit 5.2~ 3.4
H&R Sport 5.9~ 5.0
Eibach Sportline 5.5~ 4.9
Gold-line GL 5.7~ 3.4
Gold-line GPS 4.9~ 2.9
Koni RSK Suspension kit 2.75 - 3.66~ 4.8
Neuspeed SofSports 4.6~ 2.7
Neuspeed Sport 5.0~ 3.2
Neuspeed Race 8.7~ 7.1
Skunk Coilovers -old 7.1~ 5.4
Skunk2 Coilovers - new 8.9~ 7.1
Spoon Full Coilovers 5.4~ 4.3
Spoon Progress Coilovers 6.3~ 4.5
Spoon Progress Lowering Springs 5.7~ 3.6
Ground Control Coilover 6.8~ 5.0
Tein RA/RE/RS 14.0~ 10.0
Tein HT 20.0~ 8.0
Tein HG 6.5~ 2.3 - 3.5
Tein SS 8.0~ 4.0
Tein Flex 9.0~ 5.0
Tein S. Tech 4.2~ 2.5
Tokico Illumina Kit 4.5~ 2.2
APEX'i WS 8.0~ 3.2
SSR Cup 7.0~ 5.0
SSR S1 8.0~ 8.0
http://www.ek9.org/forum/suspension/...rings-ek9.html
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